Congratulations! Switching from Epson x880 to Canon iPFx300 was the happiest day in my printing history My present PRO-4000 has only one big issue - it doesn't want to die and still works flawlessly after 8 years of use, so I have no reason to buy new PRO-4600 which is simply fantastic and substantial upgrade... You'll gonna love it!
Still on my 8400, which refuses to die, but I do need more speed, and a take up reel for a lot of jobs.
Dan, which version of Onyx are you running - once you get really used to running a RIP, you never look back!
I'm almost thinking to keep 44" as a 4600, and getting an 80600 for lower grade, but good production work (phototex, vinyl, banner), all of which crawls through on an art printer. I couldn't live without a rip, particularly for the demanding clients and the volume jobs.